A phrase that should follow an unreasonably pejorative, irrational/illogical, or clearly dumb-ass remark. Used as an interjection, to call someone out for being an IGNORANT BRAYING ASS. (probably best used via text format, as actually saying "hee haw" may detract from the intended effect...).

A subtle yet effective way of pointing out someone's stupidity- as they most likely won't even get your reference in the first place (and may in fact think you are laughing WITH them)- without having to be too frank.